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主题:灌注去细胞化的基质——用原生态平台构建人工生物心脏
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说明:原文来源自nature medicine,由干细胞之家新闻小组成员deron翻译(转帖请注明)。 F& F# G6 p" s* b5 s) O
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翻译内容:在美国,大约有三千人在等待供者心脏;在全世界,有两千两百万的人伴有心脏衰竭。对于需要移植或者机械左心室支撑的人来说,理论上可以选择人工心脏。制造一个人工心脏需要设计出合理的心脏结构、合适的细胞组分以及动力系统。通过冠脉灌注的方式,我们用去垢剂将心脏的细胞去除,保留基本的细胞外基质,从而制造出一个无细胞但拥有可灌注性的血管结构、无细胞但有活性的瓣膜和完整的腔室。为了模拟心脏细胞构成,我们用心肌细胞或内皮细胞接种回上述结构里。为让它们行使功能,在长达二十八天的时间内,我们在一个模拟心脏生理环境的生物反应器中,通过冠脉持续灌注了八个结构。在第四天,我们肉眼观察到了心脏挛缩。第八天,在生理诱导和电刺激下,结构复合物能够在一个修饰过的工作心脏标本中产生搏动功能(等同于成人心脏功能的2%或16周胎儿心脏功能的25%)。- _# U8 o. w- M; D' R9 X
原摘要:About 3,000 individuals in the United States are awaiting a donor heart; worldwide, 22 million individuals are living with heart failure. A bioartificial heart is a theoretical alternative to transplantation or mechanical left ventricular support. Generating a bioartificial heart requires engineering of cardiac architecture, appropriate cellular constituents and pump function. We decellularized hearts by coronary perfusion with detergents, preserved the underlying extracellular matrix, and produced an acellular, perfusable vascular architecture, competent acellular valves and intact chamber geometry. To mimic cardiac cell composition, we reseeded these constructs with cardiac or endothelial cells. To establish function, we maintained eight constructs for up to 28 d by coronary perfusion in a bioreactor that simulated cardiac physiology. By day 4, we observed macroscopic contractions. By day 8, under physiological load and electrical stimulation, constructs could generate pump function (equivalent to about 2% of adult or 25% of 16-week fetal heart function) in a modified working heart preparation., T. i5 k' |4 N2 @2 Y
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2 f; P0 h- z6 H% R3 f/ j5 U$ J6 E说明:这是一篇08年的文献,虽然看上去有点年代久远的味道,不过去年11月份各大论坛争相转载的“再造小型人工肝脏”的报道,其方法大部分来自于此。 |
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